Defensive publication

ABSTRACT

PHOTOGRAPHIC LAYERS, EMULSION AND ELEMENTS COMPRISING THEM ARE STABILIZED AGAINST COLOR BALANCE DISTROTION BY ADDITION OF CARBOXY SUBSTITUTED 4-THIOURACILS. SPECIFIC EXAMPLES OF STABILIZERS INCLUDE 1-CARBOXYL 5(H)-CYCLOPENTA-(D)-4-THIOURACIL. SILVER HALIDE-CONTAINING LAYERS. EMULSIONS AND ELEMENTS SO STABILIZED CAN BE CHEMICALLY SENSITIZED, E.G., WITH NOBLE METAL SENSITIZERS ALONE OR IN COMBINATION WITH SULFUR, SELENIUM OR TELLURIUM. THEY CAN CONTAIN SPECTRAL SENSITIZERS, INCORPORATED COLOR FORMING COUPLERS, INCORPORATED DEVELOPING AGENTS, ANTIFOGGANTS, HARDENERS, PLASTICIZERS, COATING AIDS AND OTHER SUITABLE PHOTOGRAPHIC ADDENDA SUCH AS DESCRIBED IN U.S. PAT. 3,297,446 ISSUED TO DUNN ON JAN. 10, 1967 (COLUMNS 4 TO 9). LIKEWISE, THE SILVER HALIDE GRAINS CAN BE PREPARED AS CONVERTED HALIDES OR AS SIMPLE HALIDES.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.0. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The bending of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Omce makeno assertion as to the novelty of the disclosed subject matter.

PUBLISHED JANUARY 26, 1971 882 O.Gr. 1346' T882,019 PHOTOGRAPH-HQ MATERIALS CURVE SHAPE STABILIZED WITH CARBOXY SUBSTITUTED 4-THIOURACILS Thomas Irving Abbott, Eastman Kodak Co., Kodak Park Division, Rochester, N.Y. 14650 Filed May 14, 1970, Ser. No. 37,323 Int. Cl. G03c 1/34, 1/76, J/28 U.S. Cl. 96-109 No Drawing. 30 Pages Specification Photographic layers, emulsions and elements comprising them are stabilized against color balance distortion by addition of carboxy substituted 4-thiouracils. Specific examples of stabilizers include l-carboxyalkyl 5(H)-cyclopenta-(d)-4-thiouracil. Silver halide-containing layers, emulsions and elements so stabilized can be chemically sensitized, e.g., with noble metal sensitizers alone or in combination with sulfur, selenium or tellurium. They can contain spectral sensitizers, incorporated color forming couplers, incorporated developing agents, antifoggants, hardeners, plasticizers, coating aids and other suitable photographic addenda such as described in US. Pat. 3,297,446 issued to Dunn on Jan. 10, 1967 (columns 4 to 9). Likewise, the silver halide grains can be prepared as converted halides or as simple halides. 

